Which two nitrogenous bases are the pyrimidines

What would happen if the krill were removed from the food web

What factors contribute to the effect an environmental toxin has on the human body?

You want to cultivate some exotic plants at your farm. however, the climate is chillier than the temperature range favorable to the crop. which is the best method to use for the cultivation of this exotic crop? a. use a crop rotation method b. use a lot of fertilizer c. prepare the seed bed properly d. use a greenhouse e. use irrigation